/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.business.activiti.controller;

import com.business.activiti.service.ActivitiService;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.repository.Model;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.*;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;

/**
 * @author Tijs Rademakers
 */
@Controller
@RequestMapping("service")
public class ModelSaveRestResource implements ModelDataJsonConstants {
  
  protected static final Logger LOGGER = LoggerFactory.getLogger(ModelSaveRestResource.class);

  @Autowired
  private RepositoryService repositoryService;
  @Autowired
  private ActivitiService activitiService;

  @Autowired
  private ObjectMapper objectMapper;

  /**
   * avtiviti在线编辑器保存流程模型
   * @param modelId
   * @param values
   */
  @RequestMapping(value="/model/{modelId}/save", method = RequestMethod.PUT)
  @ResponseStatus(value = HttpStatus.OK)
  public void saveModel(@PathVariable String modelId, @RequestBody MultiValueMap<String, String> values) {
      try {
          Model model = repositoryService.getModel(modelId);

          ObjectNode modelJson = (ObjectNode) objectMapper.readTree(model.getMetaInfo());

          modelJson.put(MODEL_NAME, values.getFirst("name"));
          modelJson.put(MODEL_DESCRIPTION, values.getFirst("description"));
          model.setMetaInfo(modelJson.toString());
          model.setName(values.getFirst("name"));

          repositoryService.saveModel(model);

          repositoryService.addModelEditorSource(model.getId(), values.getFirst("json_xml").getBytes("utf-8"));

          InputStream svgStream = new ByteArrayInputStream(values.getFirst("svg_xml").getBytes("utf-8"));
          TranscoderInput input = new TranscoderInput(svgStream);

          PNGTranscoder transcoder = new PNGTranscoder();
          // Setup output
          ByteArrayOutputStream outStream = new ByteArrayOutputStream();
          TranscoderOutput output = new TranscoderOutput(outStream);

          // Do the transformation
          transcoder.transcode(input, output);
          final byte[] result = outStream.toByteArray();
          repositoryService.addModelEditorSourceExtra(model.getId(), result);
          outStream.close();
          activitiService.modelDeploy(model.getId());
      } catch (Exception e) {
          LOGGER.error("Error saving model", e);
          throw new ActivitiException("Error saving model", e);
      }
  }
}
